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Cover - shares
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Document Entity Information    
Document Type 20-F  
Document Registration Statement false  
Document Annual Report true  
Document Transition Report false  
Document Shell Company Report false  
Document Period End Date Dec. 31, 2024  
Entity File Number 001-38230  
Entity Registrant Name Qudian Inc.  
Entity Incorporation, State or Country Code E9  
Entity Address, Address Line One Building 1, Qudian Innovation Park, Meilin Street  
Entity Address, Address Line Two Tongan District  
Entity Address, City or Town Xiamen  
Entity Address, Country CN  
Entity Well-known Seasoned Issuer No  
Entity Voluntary Filers No  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Accelerated Filer  
Entity Emerging Growth Company false  
ICFR Auditor Attestation Flag true  
Document Financial Statement Error Correction [Flag] false  
Document Accounting Standard U.S. GAAP  
Entity Shell Company false  
Entity Central Index Key 0001692705  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2024  
Document Fiscal Period Focus FY  
Amendment Flag false  
Auditor Firm ID 5395 1408
Auditor Name Marcum Asia CPAs LLP Ernst & Young Hua Ming LLP
Auditor Location New York, New York Shanghai, the People’s Republic of China
Business Contact    
Document Entity Information    
Entity Address, Address Line One Building 1, Qudian Innovation Park, Meilin Street  
Entity Address, Address Line Two Tongan District,  
Entity Address, City or Town Xiamen  
Entity Address, Country CN  
Contact Personnel Name Min Luo, Chairman and Chief Executive Officer  
Country Region 86  
City Area Code 592  
Local Phone Number 596-8208  
Contact Personnel Email Address ir@qudian.com  
Class A ordinary shares    
Document Entity Information    
Title of 12(b) Security Class A Ordinary Shares  
No Trading Symbol Flag true  
Entity Common Stock, Shares Outstanding 105,198,013  
Class B ordinary shares    
Document Entity Information    
Entity Common Stock, Shares Outstanding 63,491,172  
American Depositary Shares    
Document Entity Information    
Title of 12(b) Security American Depositary Shares  
Trading Symbol QD  
Security Exchange Name NYSE